Improvement in saws



c. n.- L'oTHnoP.

Saws.

- No.l47,335. PatentedFeb.1o,1874.

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WITNESSES: INVENTUB #www4 QM BY I v r mmmns.Y

UNITED STATES PATENT @EEreE CHARLES I). LOTHROI, OF NEV YORK, X. Y.

IMPROVEMENT IN SAWS.

Specification forming part of Letters Patent No. 1417,335, datedFebruary 10, 1874; application filed January l0. 1874.

To all whom it may concern:

Be it known that I, CHARLES l). Lc'rnuor, of the city, county, and Stateof New York, have invented a new and Improved Saw, ot' which thefollowing is a specification:

rI`he invention will rst be fully described, and then pointed out in theclaim.

Figure lis a side elevation of a part of a circular-saw blade with teetharranged aecording to my invention. Fig. 2 is a section ou the line .rx. Fig. 3 is a section on the line 1/ y, and Fig. 4 is a section on theline z z.

Similar letters of reference indicate corresponding parts.

A` represents the teeth for cutting off the fibers. They are like anyordinary cross-cutting teeth, except they are beveled a good deal moreto make sharp knife-edge points for cutting off the bers nicely, andthey are set by bending them outward a little near the points. They arearranged in groups of four, or thereabout, and between each group is aplaning clearing-tooth, B, led square to the saw-plate, and arranged ona pitch, by which it is adapted to plane out the stuft' cut ott' butleft in the ker-f by the teeth A. In front of each planing-tooth A is awide notch, G, for clearance, with the bottom I) beveled acutely to thesaw-plate, so that the dust kept in the notch, while passing through thelog, by the walls of the kerf, will shoot o' at the side as soon as itemerges from the log, whereas it clogs in so hard sometimes, when t-hebottom is square to the saw-plate, as to be carried until cleared out byhand. y

By thus arranging' the teeth, the saw is rendered equally as useful forcutting one way ot' the grain as the other, so that it saves thenecessity of shifting saws for cutting different ways, as is necessarywith all other saws.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 'Ihe bottom of the clearingnotches D, beveled acutelyto the sawplate, as described.

- l GHAS. l). LOTHROP. Witnesses:

A. P. {F1-MYER, T. B. MosHER.

